This report details the names and locations of all DNS servers on the internet, as well as the number of domains that are serviced by these servers. In this fashion, we can discover

• the number of sites hosted by ISPs
• the number of sites hosted by hosting companies that use an ISP's facilities, but run their own name servers
• the number of sites hosted by specialty DNS service providers
• the organizations that choose to operate their own DNS servers rather than to use those of their ISP/hosting provider.

The survey works by determining each month the authoritative name server for each host (and more accurately, each domain) in our survey. We then count the number of domains hosted on each DNS server.

Search

Curious about the size of a the domain set handled by a particular ISP's name servers? Try searching for the ISP's name server. For example, to find Exodus' name servers, try exodus.

Top 20 by Host Name

The top 20 name servers ranked according to the number of domains handled by each name server, with a name server uniquely identified by its fully qualifed name, are shown below.

Name Server Name	Name Server IP	Domains
sca02.sec.dns.exodus.net	209.1.235.120	694
dns01.exodus.net	209.1.222.244	351
dns02.exodus.net	209.1.222.245	343
dns03.exodus.net	209.1.222.246	316
dns04.exodus.net	209.1.222.247	240
exodus.hipdesign.com	63.236.10.5	111
exodus.xpr.com	24.173.166.166	44
ns1.exodusgroup.net	66.180.166.32	41
ns2.exodusgroup.net	66.180.161.32	36
exodus.ssmnet.net	66.162.55.131	31
exodus.eccentrichosting.net	64.62.139.39	28
sca03.sec.dns.exodus.net	216.32.126.150	27
sntc04sdns01.exodus.net	64.14.1.122	25
wlhm025dns01.exodus.net		19
exodus.theworldat.com	209.101.130.4	19
exodus2.theworldat.com	209.101.130.5	17
sca03.auth.dns.exodus.net	209.185.253.230	16
sca04.auth.dns.exodus.net	216.32.104.10	16
exodus.icorp.net	204.107.221.30	16
exodus.marketu.com	65.39.136.43	12

Survey Limitations

Our survey, while having an impressive 24,787,718 sites and 11,128,761 domains in the data set, does not include all web sites and domains. We only include those that we consider active, which, by our definition, means we found the site via a link from somewhere else. Sites not linked by anyone are by definition not included in the survey.

We also actively drop sites out of the survey that fail to respond 3 consecutive months to our HTTP queries. So, while a DNS server might still respond with information for a domain, if there is no active web site that we can reach for the domain in question, then the domain is not included in this survey at all, even if it still has other functioning services (such as email).